General,
I could be wrong, but I think the difference is that your bank will post the funds in your account before the check technically clears. WHile neteller waits until the check has technically cleared before making the funds available to you. In fairness to neteller, I recently sent an EFT to citibank to pay off one of my credit cards. And even though I saw the money leave my checking account I had to wait about 3 more business days before citibank would acknowledge that the funds cleared, and free up the credit on the card.